My descriptions that are a part of /rsubsection are long, and go all the way to the right side of the page, allowing for messy margins. Does anyone know how to set margins on this template for /rsubsection so it has a cleaner look? Thanks!

please show us sample code, because it's unclear what this problem description actually means: text on the left too wide, or text on the right, first line or second line, or item lines, rSubsection has 4 parameters. Maybe you need to change the general document margins, changing just subsection margins only seems odd. Or encapsulate parts of the arguments/parameters in a \parbox command to have it wrapped.